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Health and Safety Information 183
Potentially Explosive Environments
T-Ratings: Phones rated T3 or T4 meet FCC requirements and are likely to be more 
usable with a hearing device’s telecoil (“T Switch” or “Telephone Switch”) than 
unrated phones. T4 is the better/higher of the two ratings. (Note that not all hearing 
devices have telecoils in them.)
Hearing devices may also be measured for immunity to this type of interference. 
Your hearing device manufacturer or hearing health professional may help you find 
results for your hearing device. The more immune your hearing aid is, the less likely 
you are to experience interference noise from mobile phones.
Other Medical Devices
If you use any other personal medical devices, consult the manufacturer of your 
device to determine if it is adequately shielded from external RF energy. Your 
physician may be able to assist you in obtaining this information. Switch your phone 
off in health care facilities when any regulations posted in these areas instruct you to 
do so. Hospitals or health care facilities may be using equipment that could be 
sensitive to external RF energy.
Vehicles
RF signals may affect improperly installed or inadequately shielded electronic 
systems in motor vehicles. Check with the manufacturer or its representative 
regarding your vehicle. You should also consult the manufacturer of any equipment 
that has been added to your vehicle.
Posted Facilities
Switch your phone off in any facility where posted notices require you to do so.
Potentially Explosive Environments
Switch your phone off when in any area with a potentially explosive atmosphere and 
obey all signs and instructions. Sparks in such areas could cause an explosion or fire 
resulting in bodily injury or even death.
Users are advised to switch the phone off while at a refueling point (service station). 
Users are reminded of the need to observe restrictions on the use of radio equipment 
in fuel depots (fuel storage and distribution areas), chemical plants or where blasting 
operations are in progress.
Areas with a potentially explosive atmosphere are often but not always clearly 
marked. They include below deck on boats, chemical transfer or storage facilities, 
vehicles using liquefied petroleum gas (such as propane or butane), areas where the